SPC 0100Z Day 1 Outlook

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
0635 PM CST Wed Jan 20 2021

Valid 210100Z - 211200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Isolated non-severe thunderstorms are possible across the Lower
Colorado Valley and southern Arizona tonight.

...01z Update...

Early-evening water-vapor imagery depicts a well-defined upper low
off the northern Baja Peninsula. This feature is moving slowly
northeast and should track across the northern Baja by sunrise
Thursday. Numerous showers, and a few thunderstorms, are currently
noted within the left exit region of a 90kt 500mb speed max. This
convection is mostly south of the international border, but a few
flashes of lightning have been observed over southern Yuma County
AZ. While 21/00z 1Y7 sounding was not particularly unstable, steep
lapse rates between 3-6km contribute to some buoyancy. Favorable
trajectories should encourage a few storms to spread across the
desert southwest during the overnight hours.

..Darrow.. 01/21/2021

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